Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice.
Your 70 years old husband has
dry mouth for several days now, while taking
hydrochlorothiazide a couple of months ago. However, no data regarding use of antibiotics recently.
Dry mouth could be due to
dehydration (caused by hydrochlorothiazide use);
diabetes (also related to hydrochlorothiazide use) and candida overgrowth (antibiotic use).
So, he needs to get a few diagnostic tests done:
- complete blood count
- diabetes testing
- check blood electrolytes
- mouth swab for candida
For the moment, get proper
oral hygiene, gargle with warm water with soda bicarbonate; apply honey orally; avoid citrus/frizzy foods/drinks.
Hope I have answered your query. Let me know if I can assist you further.